The stadium has a capacity of 29.448 people.[2] The original capacity was over 50,000 but was decreased by numerous modifications.[1]

The statium was expanded between March 1976 and July 1979 and the first game was between the VfL Bochum and SG Wattenscheid 09 on July 21, 1979.[2] This expansion could technically count as a complete rebuild, it's officially a expansion due to legal reasons.[3]